Cita APA (7a ed.)
Ettema, R., & Mutel, C. F. (2014). Hans Albert Einstein: His life as a pioneering engineer. American Society of Civil Engineers.
Cita Chicago Style (17a ed.)
Ettema, R., y Cornelia Fleischer Mutel. Hans Albert Einstein: His Life as a Pioneering Engineer. Reston, Virginia: American Society of Civil Engineers, 2014.
Cita MLA (9a ed.)
Ettema, R., y Cornelia Fleischer Mutel. Hans Albert Einstein: His Life as a Pioneering Engineer. American Society of Civil Engineers, 2014.
Precaución: Estas citas no son 100% exactas.